Dallas—Texas Instruments' TPA203xD1 series of class-D audio amps for portable consumer electronics, taking half the board real-estate of competing solutions, claims an A-weighted noise floor of 27 µVrms, the lowest in the industry. TI says these amps improve PSRR by 20 dB and CMRR by 12 dB over competing devices.
The fixed-gain amps (2, 3, and 4 V/V versions available), which integrate the normally external matched input resistors to optimize noise performance and save space, have an efficiency of as high as 88 percent (2.75 watts to a 4-ohm load, 5-volt supply; 600 mW into 8 ohms, 3.6-volt supply). Typical CMRR is -69 dB and PSRR is -73 dB at 217 Hz. These devices are pin-compatible with the TPA2010D2 audio amp, a variable gain class-D amplifier.
Click here, here, and here to access the datasheets for the TPA2032D1, -3D1, and -4D1, respectively. The TPA203xD1 devices, in a lead-free 1.5-by-1.5 mm WCSP package, are priced at 60 cents each in 1k quantities. An evaluation module is available to speed designs.
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